using UnityEngine;
using UnityEngine.UI;
 
public class ScreenShotTest : MonoBehaviour
{
  public RawImage img;
 
  private void Update()
  {
    //使用ScreenCapture.CaptureScreenshot
    if (Input.GetKeyDown(KeyCode.A))
    {
      ScreenCapture.CaptureScreenshot(Application.dataPath + "/Resources/Screenshot.jpg");
      img.texture = Resources.Load("Screenshot");
    }
 
    //使用ScreenCapture.CaptureScreenshotAsTexture
    if (Input.GetKeyDown(KeyCode.S))
    {
      img.texture = ScreenCapture.CaptureScreenshotAsTexture(0);
    }
 
    //使用ScreenCapture.CaptureScreenshotAsTexture
    if (Input.GetKeyDown(KeyCode.D))
    {
      RenderTexture renderTexture = new RenderTexture(720, 1280, 0);
      ScreenCapture.CaptureScreenshotIntoRenderTexture(renderTexture);
      img.texture = renderTexture;
    }
  }
}

using UnityEngine;
using System.Collections;
using System;
 
public class ScreenShotTest : MonoBehaviour
{
  private void Update()
  {
    if (Input.GetKeyDown(KeyCode.A))
    {
      StartCoroutine(CaptureByRect());
    }
  }
 
  private IEnumerator CaptureByRect()
  {
    //等待渲染线程结束
    yield return new WaitForEndOfFrame();
    //初始化Texture2D, 大小可以根据需求更改
    Texture2D mTexture = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
    //读取屏幕像素信息并存储为纹理数据
    mTexture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
    //应用
    mTexture.Apply();
    //将图片信息编码为字节信息
    byte[] bytes = mTexture.EncodeToPNG();
    //保存(不能保存为png格式)
    string fileName = DateTime.Now.Hour + ":" + DateTime.Now.Minute + ":" + DateTime.Now.Second + ".jpg";
    System.IO.File.WriteAllBytes(Application.streamingAssetsPath + "/ScreenShot/" + fileName, bytes);
 
    UnityEditor.AssetDatabase.Refresh();
  }
}